How to make particle system animate in different key frames
Try something like this. I used a sphere as an instanced particle. In the field of the Value Node, enter #frame which will make the value correspond to the current frame number as you animate.
I made a simple &quot;solid until frame 100 - transparent until frame 200&quot; setup using Math Nodes set to Greater Than as a mix factor for the transparent mixes. If you are using EEVEE, remember to change the Blend Mode of the material to something other than Opaque, and also disable the shadows under Shadow Mode (as they will be visible when transparent otherwise).